Figures
Not a second set of books: the figures come from the Belege, the hours and the stock that are recorded anyway.

What you do with it
Whether you are on course is on the overview — with the contribution margin and the contribution margin on labour.
The quote's margin on the order, against what was actually incurred. Funktionsstufen with pay, cost and rate, and the cost rate from the monthly wage.
Open receivables and how old they are, the value of the stock and a thirteen-week cash forecast.
The crew's productivity, a weekly report and the list of what is still missing before the figures are right.
Everything in this area
45 minutes using one of your jobs: from capture on site through to the certificate and invoice.